Vis enkel innførsel

dc.contributor.advisorFjeld, Elin
dc.contributor.authorKwak, Hyeonyoung
dc.date.accessioned2021-09-06T16:12:30Z
dc.date.available2021-09-06T16:12:30Z
dc.date.issued2021
dc.identifierno.usn:wiseflow:2636125:43485472
dc.identifier.urihttps://hdl.handle.net/11250/2773852
dc.description.abstractCharging large battery packs requires high currents, especially for short-term charging of electric vehicles. The ohmic losses heats up power cables and is the limiting factor for the current capacity. However, the power cables may be overloaded for short periods because of the thermal inertia. Therefore, there can be great advantages if one knows both the short-term and long-term current limitations for the power cables. Color Hybrid is a hybrid ferry, and the charging station is supplied by a 12 and 24 kV XLPE 240 mm2 Al cable. Loading and temperature data from Lede has been obtained, and a laboratory setup with a set of XLPE 24 kV cables in air will be constructed at the USN High Current Laboratory. The lab setup should be able to recreate the obtained data. The laboratory setup will have two cable formations, namely flat and trefoil, where temperature measurements are taken from the cable surface, and the cable conductor surface. Thermal response for long-term and short-term charging is used to calculate thermal properties. A simplified thermal model is created using the calculated thermal properties. The model makes a good long-term temperature prediction but fails to provide accurate data for short-term loading. Therefore, the model parameters were optimized to minimize the simulation error for both long- and short-term charging. The resulting thermal model estimates 15 higher conductor temperature for trefoil formation compared to measurements. The thermal model is able to emulate temperature responses from cyclic charging profiles with two loading periods and a resting time between the loadings. From this, illustrations and are made to show the correlations between the loading currents, the loading duration, and the resting time. These illustrations may be used for optimization of the charging schedule for one or more electric/hybrid ferries.
dc.description.abstract
dc.languageeng
dc.publisherUniversity of South-Eastern Norway
dc.titleThermal capacity and loading assessment for 24 kV XLPE-insulated cables in air
dc.typeMaster thesis


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel